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page cache: Convert delete_batch to XArray 

Rename the function from page_cache_tree_delete_batch to just
page_cache_delete_batch.

Signed-off-by: Matthew Wilcox <willy@infradead.org>
This commit is contained in:
Matthew Wilcox 2017-12-04 03:59:45 -05:00
parent a332125fc3
commit ef8e5717db
1 changed files with 13 additions and 15 deletions
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28
mm/filemap.c
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@ -272,7 +272,7 @@ void delete_from_page_cache(struct page *page)
EXPORT_SYMBOL(delete_from_page_cache); EXPORT_SYMBOL(delete_from_page_cache);
/* /*
* page_cache_tree_delete_batch - delete several pages from page cache * page_cache_delete_batch - delete several pages from page cache
* @mapping: the mapping to which pages belong * @mapping: the mapping to which pages belong
* @pvec: pagevec with pages to delete * @pvec: pagevec with pages to delete
* *
@ -285,23 +285,18 @@ EXPORT_SYMBOL(delete_from_page_cache);
* *
* The function expects the i_pages lock to be held. * The function expects the i_pages lock to be held.
*/ */
static void static void page_cache_delete_batch(struct address_space *mapping,
page_cache_tree_delete_batch(struct address_space *mapping,
struct pagevec *pvec) struct pagevec *pvec)
{ {
struct radix_tree_iter iter; XA_STATE(xas, &mapping->i_pages, pvec->pages[0]->index);
void **slot;
int total_pages = 0; int total_pages = 0;
int i = 0, tail_pages = 0; int i = 0, tail_pages = 0;
struct page *page; struct page *page;
pgoff_t start;
start = pvec->pages[0]->index; mapping_set_update(&xas, mapping);
radix_tree_for_each_slot(slot, &mapping->i_pages, &iter, start) { xas_for_each(&xas, page, ULONG_MAX) {
if (i >= pagevec_count(pvec) && !tail_pages) if (i >= pagevec_count(pvec) && !tail_pages)
break; break;
page = radix_tree_deref_slot_protected(slot,
&mapping->i_pages.xa_lock);
if (xa_is_value(page)) if (xa_is_value(page))
continue; continue;
if (!tail_pages) { if (!tail_pages) {
@ -310,8 +305,11 @@ page_cache_tree_delete_batch(struct address_space *mapping,
* have our pages locked so they are protected from * have our pages locked so they are protected from
* being removed. * being removed.
*/ */
if (page != pvec->pages[i]) if (page != pvec->pages[i]) {
VM_BUG_ON_PAGE(page->index >
pvec->pages[i]->index, page);
continue; continue;
}
WARN_ON_ONCE(!PageLocked(page)); WARN_ON_ONCE(!PageLocked(page));
if (PageTransHuge(page) && !PageHuge(page)) if (PageTransHuge(page) && !PageHuge(page))
tail_pages = HPAGE_PMD_NR - 1; tail_pages = HPAGE_PMD_NR - 1;
@ -322,11 +320,11 @@ page_cache_tree_delete_batch(struct address_space *mapping,
*/ */
i++; i++;
} else { } else {
VM_BUG_ON_PAGE(page->index + HPAGE_PMD_NR - tail_pages
!= pvec->pages[i]->index, page);
tail_pages--; tail_pages--;
} }
radix_tree_clear_tags(&mapping->i_pages, iter.node, slot); xas_store(&xas, NULL);
__radix_tree_replace(&mapping->i_pages, iter.node, slot, NULL,
workingset_lookup_update(mapping));
total_pages++; total_pages++;
} }
mapping->nrpages -= total_pages; mapping->nrpages -= total_pages;
@ -347,7 +345,7 @@ void delete_from_page_cache_batch(struct address_space *mapping,
unaccount_page_cache_page(mapping, pvec->pages[i]); unaccount_page_cache_page(mapping, pvec->pages[i]);
} }
page_cache_tree_delete_batch(mapping, pvec); page_cache_delete_batch(mapping, pvec);
xa_unlock_irqrestore(&mapping->i_pages, flags); xa_unlock_irqrestore(&mapping->i_pages, flags);
for (i = 0; i < pagevec_count(pvec); i++) for (i = 0; i < pagevec_count(pvec); i++)